Index: uspace/lib/ui/include/types/ui/window.h
===================================================================
--- uspace/lib/ui/include/types/ui/window.h	(revision f1f433d10ab8dfdc792a9cdc8807b76dbcfac663)
+++ uspace/lib/ui/include/types/ui/window.h	(revision c48192e563fb04c9bdbb35e760ca93083189dc21)
@@ -66,5 +66,7 @@
 typedef enum {
 	/** Popup window */
-	ui_wndf_popup = 0x1
+	ui_wndf_popup = 0x1,
+	/** Special system window */
+	ui_wndf_system = 0x2
 } ui_wnd_flags_t;